VEGA MoRoS Modem - ISDN 1.3 - Manual (Page 52)

Functions MoRoS Modem - ISDN 1.3
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failed ping will make sure that the connection is re-initiated, if it was closed
after the last data packet or ping. The existing connection is not terminated, if
the ping is not responded to.
Save the settings, by clicking "OK" (Figure 16, page 37, above, position 10).
12.6.4 Setting up a Dialing Filter
To avoid unnecessary costs due to undesired dial-out events, a dialing filter may be acti-
vated as an option. With this dialing filter, the network traffic which could trigger a dial-
out event can be restricted. After a dial-out connection is established, however, all par-
ticipants in the network may access the dial-out connection and transmit IP data.
Certain ports or IP addresses may be authorized or forbidden. For example, if a partici-
pant is allowed to trigger the dial-out connection using a specific IP address, then all
other IP addresses are automatically blocked for triggering a connection, which have not
been specifically permitted. If by mistake a port or an address are declared both allowed
and forbidden, then the MoRoS Modem - ISDN 1.3 will remove the entries for the forbid-
den ports and addresses, which intersect with allowed entries, during the saving process.
The allowed ports will be maintained.
Configuration with the web interface
To activate the dialing filter, mark the checkbox "Activate dialing filter" (Figure
16, page 37 above, position 12).
To only allow connections from individual ports, enter the allowed ports in
the field "Packets from this port may initiate a connection" (Figure 16, page
37, above, Position 9). As an alternative, you may also exclude certain ports by
entering port numbers in the fields of "Packets from these ports may not initi-
ate a connection". Analogously, you may allow or forbid connections to cer-
tain destination ports.
To only allow connections from individual IP addresses, enter the allowed IP
addresses in the field "These computers may initiate a connection" (Figure 16,
page 37, above, position 11). As an alternative, you may also exclude certain IP
addresses by entering the IP address in the fields at "These computers may
not initiate a connection". Analogously, you may allow or forbid connections
to certain IP addresses.
Save the settings, by clicking "OK" (Figure 16, Page 37, above, Position 10).
12.7 Port Forwarding
12.7.1 Creating a Port Forwarding Rule
When including the Internet as communication network, private and public IPs are dis-
tinguished. To be able to access the private IP addresses from the Internet, which are
mostly used in local networks, the technologies NAT and port forwarding are used. In the
Internet, only the public IP address of the MoRoS Modem - ISDN 1.3 can be reached. This
IP address can be used to also access the local end terminals in the network of the MoRoS
Modem - ISDN 1.3 from the Internet, if NAT and port forwarding are used.